Q5.1
A car engine is suspended from a chain linked at O to two
other chains. Which of the following forces should be
included in the free-body diagram for the engine?
A. tension T1
B. tension T2
C. tension T3
D. two of the above
E. T1, T2, and T3
© 2012 Pearson Education, Inc.
A5.1
A car engine is suspended from a chain linked at O to two
other chains. Which of the following forces should be
included in the free-body diagram for the engine?
A. tension T1
B. tension T2
C. tension T3
D. two of the above
E. T1, T2, and T3
© 2012 Pearson Education, Inc.
Q5.2
A cable attached to a car holds the
car at rest on the frictionless ramp
(angle ).
The ramp exerts a normal force on
the car. How does the magnitude n
of the normal force compare to the
weight w of the car?
A. n = w
B. n > w
C. n < w
D. not enough information given to decide
© 2012 Pearson Education, Inc.
A5.2
A cable attached to a car holds the
car at rest on the frictionless ramp
(angle ).
The ramp exerts a normal force on
the car. How does the magnitude n
of the normal force compare to the
weight w of the car?
A. n = w
B. n > w
C. n < w
D. not enough information given to decide
© 2012 Pearson Education, Inc.
Q5.3
A cart (weight w1) is attached
by a lightweight cable to a
bucket (weight w2) as shown.
The ramp is frictionless.
When released, the cart accelerates up the ramp.
Which of the following is a correct free-body diagram for the cart?
n
n
n
n
T
T
T
T
w1
w1
A.
© 2012 Pearson Education, Inc.
w1
B.
m1 a
C.
w1
m1 a
D.
A5.3
A cart (weight w1) is attached
by a lightweight cable to a
bucket (weight w2) as shown.
The ramp is frictionless.
When released, the cart accelerates up the ramp.
Which of the following is a correct free-body diagram for the cart?
n
n
n
n
T
T
T
T
w1
w1
A.
© 2012 Pearson Education, Inc.
w1
B.
m1 a
C.
w1
m1 a
D.
Q5.4
A cart (weight w1) is attached by
a lightweight cable to a bucket
(weight w2) as shown. The ramp
is frictionless. The pulley is
frictionless and does not rotate.
When released, the cart accelerates up the ramp and the bucket
accelerates downward. How does the cable tension T compare to w2?
A. T = w2
B. T > w2
C. T < w2
D. not enough information given to decide
© 2012 Pearson Education, Inc.
A5.4
A cart (weight w1) is attached by
a lightweight cable to a bucket
(weight w2) as shown. The ramp
is frictionless. The pulley is
frictionless and does not rotate.
When released, the cart accelerates up the ramp and the bucket
accelerates downward. How does the cable tension T compare to w2?
A. T = w2
B. T > w2
C. T < w2
D. not enough information given to decide
© 2012 Pearson Education, Inc.
Q5.5
A lightweight crate (A) and a heavy crate (B) are side by side on
a frictionless horizontal surface. You are applying a horizontal
force F to crate A. Which of the following forces should be
included in a free-body diagram for crate B?
A. the weight of crate B
B. the force of crate B on crate A
C. the force F that you exert
D. the acceleration of crate B
E. more than one of the above
© 2012 Pearson Education, Inc.
F
A
B
A5.5
A lightweight crate (A) and a heavy crate (B) are side by side on
a frictionless horizontal surface. You are applying a horizontal
force F to crate A. Which of the following forces should be
included in a free-body diagram for crate B?
A. the weight of crate B
B. the force of crate B on crate A
C. the force F that you exert
D. the acceleration of crate B
E. more than one of the above
© 2012 Pearson Education, Inc.
F
A
B
Q5.6
A toboggan of weight w
(including the passengers)
slides down a hill of angle 
at a constant speed. Which
statement about the normal
force on the toboggan
(magnitude n) is correct?
A. n = w
B. n > w
C. n < w
D. not enough information given to decide
© 2012 Pearson Education, Inc.
A5.6
A toboggan of weight w
(including the passengers)
slides down a hill of angle 
at a constant speed. Which
statement about the normal
force on the toboggan
(magnitude n) is correct?
A. n = w
B. n > w
C. n < w
D. not enough information given to decide
© 2012 Pearson Education, Inc.
Q5.7
You are pushing a 1.00-kg food
tray through the cafeteria line with
a constant 9.0-N force. As the tray
moves, it pushes on a 0.50-kg milk
carton. If the food tray and milk
carton move at constant speed,
A. the tray exerts more force on the milk carton than the milk
carton exerts on the tray.
B. the tray exerts less force on the milk carton than the milk
carton exerts on the tray.
C. the tray exerts as much force on the milk carton as the
milk carton exerts on the tray.
© 2012 Pearson Education, Inc.
A5.7
You are pushing a 1.00-kg food
tray through the cafeteria line with
a constant 9.0-N force. As the tray
moves, it pushes on a 0.50-kg milk
carton. If the food tray and milk
carton move at constant speed,
A. the tray exerts more force on the milk carton than the milk
carton exerts on the tray.
B. the tray exerts less force on the milk carton than the milk
carton exerts on the tray.
C. the tray exerts as much force on the milk carton as the
milk carton exerts on the tray.
© 2012 Pearson Education, Inc.
Q5.8
You are pushing a 1.00-kg food
tray through the cafeteria line with
a constant 9.0-N force. As the tray
moves, it pushes on a 0.50-kg milk
carton. If the food tray and milk
carton are accelerating to the left,
A. the tray exerts more force on the milk carton than the milk
carton exerts on the tray.
B. the tray exerts less force on the milk carton than the milk
carton exerts on the tray.
C. the tray exerts as much force on the milk carton as the
milk carton exerts on the tray.
© 2012 Pearson Education, Inc.
A5.8
You are pushing a 1.00-kg food
tray through the cafeteria line with
a constant 9.0-N force. As the tray
moves, it pushes on a 0.50-kg milk
carton. If the food tray and milk
carton are accelerating to the left,
A. the tray exerts more force on the milk carton than the milk
carton exerts on the tray.
B. the tray exerts less force on the milk carton than the milk
carton exerts on the tray.
C. the tray exerts as much force on the milk carton as the
milk carton exerts on the tray.
© 2012 Pearson Education, Inc.
Q5.9
Blocks A and C are connected by a
string as shown. When released,
block A accelerates to the right and
block C accelerates downward.
There is friction between blocks A and B, but not enough to prevent
block B from slipping. If you stood next to the table during the time
that block B is slipping on top of block A, you would see
A. block B accelerating to the right.
B. block B accelerating to the left.
C. block B moving at constant speed to the right.
D. block B moving at constant speed to the left.
© 2012 Pearson Education, Inc.
A5.9
Blocks A and C are connected by a
string as shown. When released,
block A accelerates to the right and
block C accelerates downward.
There is friction between blocks A and B, but not enough to prevent
block B from slipping. If you stood next to the table during the time
that block B is slipping on top of block A, you would see
A. block B accelerating to the right.
B. block B accelerating to the left.
C. block B moving at constant speed to the right.
D. block B moving at constant speed to the left.
© 2012 Pearson Education, Inc.
Q5.10
You are walking on a level floor. You are getting good traction,
the soles of your shoes don’t slip on the floor.
so
Which of the following forces should be included in a free-body
diagram for your body?
A. the force of kinetic friction that the floor exerts on your
shoes
B. the force of static friction that the floor exerts on your shoes
C. the force of kinetic friction that your shoes exert on the floor
D. the force of static friction that your shoes exert on the floor
E. more than one of these
© 2012 Pearson Education, Inc.
A5.10
You are walking on a level floor. You are getting good traction,
the soles of your shoes don’t slip on the floor.
so
Which of the following forces should be included in a free-body
diagram for your body?
A. the force of kinetic friction that the floor exerts on your
shoes
B. the force of static friction that the floor exerts on your shoes
C. the force of kinetic friction that your shoes exert on the floor
D. the force of static friction that your shoes exert on the floor
E. more than one of these
© 2012 Pearson Education, Inc.
Q5.11
A sled moves on essentially frictionless
ice. It is attached by a rope to a vertical
post set in the ice. Once given a push,
the sled moves around the post at
constant speed in a circle of radius R.
If the rope breaks,
A. the sled will keep moving in a circle.
B. the sled will move on a curved path, but not a circle.
C. the sled will follow a curved path for a while, then move
in a straight line.
D. the sled will move in a straight line.
© 2012 Pearson Education, Inc.
A5.11
A sled moves on essentially frictionless
ice. It is attached by a rope to a vertical
post set in the ice. Once given a push,
the sled moves around the post at
constant speed in a circle of radius R.
If the rope breaks,
A. the sled will keep moving in a circle.
B. the sled will move on a curved path, but not a circle.
C. the sled will follow a curved path for a while, then move
in a straight line.
D. the sled will move in a straight line.
© 2012 Pearson Education, Inc.
Q5.12
A pendulum bob of mass m is attached
to the ceiling by a thin wire of length L.
The bob moves at constant speed in a
horizontal circle of radius R, with the
wire making a constant angle  with
the vertical. The tension in the wire
A. is greater than mg.
B. is equal to mg.
C. is less than mg.
D. is any of the above, depending on the bob’s speed v.
© 2012 Pearson Education, Inc.
A5.12
A pendulum bob of mass m is attached
to the ceiling by a thin wire of length L.
The bob moves at constant speed in a
horizontal circle of radius R, with the
wire making a constant angle  with
the vertical. The tension in the wire
A. is greater than mg.
B. is equal to mg.
C. is less than mg.
D. is any of the above, depending on the bob’s speed v.
© 2012 Pearson Education, Inc.
Q5.13
A pendulum of length L with a bob of mass m swings back and
forth. At the low point of its motion (point Q ), the tension in the
string is (3/2)mg. What is the speed of the bob at this point?
A. 2 gL
B. 2gL
P
R
C. gL
gL
D.
2
gL
E.
2
© 2012 Pearson Education, Inc.
Q
A5.13
A pendulum of length L with a bob of mass m swings back and
forth. At the low point of its motion (point Q ), the tension in the
string is (3/2)mg. What is the speed of the bob at this point?
A. 2 gL
B. 2gL
P
R
C. gL
gL
D.
2
gL
E.
2
© 2012 Pearson Education, Inc.
Q